Probably here someday. 
Seriously, I don’t think I’ve been banned from anywhere. A few conservatives have blocked me on Facebook because I call out their stupidity and they don’t have the intellectual capacity to make a cogent argument, so easier to block.
This probably doesn’t count, but I believe I still can’t drive in Indiana.
I’ve lived in NC for over 40 years.
It’s a long story.
We have plenty of time to hear (read?) it!
20 years ago or so I was banned from Wal-Mart for inadvertently writing a hot check. I got a polite and sanctimonious letter in the mail explaining that they no longer wished to have me as a shopper since I was “unreliable” and it was people like me that made them raise their prices.
Of course, I simply started paying with cash and never had another problem. A few years after that I wised up to just how evil they are and can happily say they haven’t received any of my money in well over a decade.
I once unintentionally committed a customs offense when leaving Canada. That resulted in an official letter stating that a warrant for my arrest had been issued by the Royal Canadian Mounted Police. What a trophy - I should have framed it.
A couple of decades ago I was banned from… somewhere (I don’t remember)… for mentioning faggots & peas (which I used to eat at Ye Olde King’s Head).
San Diego
What a bunch of ne’er-do-wells, miscreants, and generally odd folks we are.
Makes me happy,somehow.
I once was banned when @Marley23 touched the big ban button. But so were thousands of others…
I got thrown out of a bar in Washington, DC once for teasing the bartender about his lack of voting Congressional representation. Seriously.
Once years ago a bunch of us went into a carnival-themed bar on H Street just for a quick drink. Nobody checked us at the door, and we just walked up to the bar and started ordering. As we were talking to the bartender someone else comes up to us and demands we pay a cover. We were just starting to explain that there wasn’t anybody at the door when we came in, but before we even finished the first part of that sentence she just goes “I don’t have time for this, you’re all banned!” We flipped her off and left. Shit employees at a shit bar. Not shocking at all they went out of business shortly after that.
You must tell all! I mean, you can’t just leave us hanging with that, can you?
You haven’t missed anything there, believe me. They’ve got a great race on Memorial Day weekend, and that’s pretty much it. LOL
I got banned from a misogynist web site about for years ago. I tried extending an olive branch and some calm debate in an effort to establish a meaningful dialogue, but I was hazed and ridiculed. When I rightly criticized the perpetrators as disturbed children, out I went!
If I remember correctly, a few described themselves as “Incels”. Wow, what a surprise. 
I doubt anyone but very high profile people are excommunicated for apostasy these days, and a Catholics get abortions at a level commensurate with the non-Catholic rate. So I’m hoping it’s assaulting the Pope or trying to become a priest while female.
I’m on his side, frankly. It’s a disgrace.
It’s automatic. I’ve heard some ex-Catholics tell me they excommunicated themselves by virtue of apostasy, but it seems to me if you go to confession and admit such a sin the priest might formally excommunicate you (or tell you that you are excommunicated) until you repent and finish your penance.
~Max
They banned me for five years – years ago – because they found the empty magazine from a .30 carbine (no gun, no ammunition, nothing else gun related) in the cargo area of my car.
It felt like being arrested for motor vehicle theft because they found an oil filter in my backpack.
Oh, Canada … 
I joined a group of activists promoting ordination of women in my diocese (Call To Action). We spoke on record with journalists, had demonstrations on our main thoroughfare, did public outreach demanding women and girls have full roles in The Church, including as ordained priests and deacons. Women and girls need to be welcomed behind the altar rail with more than a dust rag in our hands.
The Bishop announced in the diocesan newspaper that unless we retracted our efforts we were excommunicated. None of us (9 or 10 men and women) retracted our efforts. We all continued our advocacy and we were welcomed into other communities of faith to worship.
So my offense was believing and publicly advocating that women and girls are equal to men and boys and should be fully included in the Catholic Church. My diocese was at the time the only diocese in the US not allowing girls to be altar servers. For a decade I drove myself and my daughter 60 miles each way every Sunday where she was welcomed as an altar server and I was a sacristan, lector, Eucharistic Minister and RCIA leader as well as taught First Communion and Conformation classes.
Let me see…
Got banned from a conservative sub on Reddit for mentioning Trump’s comment about how he said he could shoot someone on 5th Avenue and not lose any voters, even though that’s something he actually said.
Got banned from Democratic Underground for saying “there is too much vitriol in U.S. politics these days” (they apparently took it to be a case of both-sidesism)
Got banned from a liberal sub on Reddit for saying that conservatives are not nazis (some comment of that sort)
Got banned from a charismatic-faith-prophecy message board for pointing out that the 2020 election prophecies were false
Pretty sure simply losing your faith and no longer going to Mass is not grounds for excommunication, whether you confess it or not.
And I am sure you cannot excommunicate yourself. I’ve heard quite a few stories about people who wanted out the Mother Church with a formal anathema published against them that they could frame, and how deeply frustrating it was for them that this does not happen. To the Catholic Church, rites are permanent. Evil priests may be forbidden to practice but they will die priests, for example.