Living rooms are common spaces, and in shared housing that means you can’t just decide that you control the terms of the living room. In shared housing, the bedroom is the private area that you can control, and that is where you can go for privacy. It’s not ideal, but when you take money from other people in exchange for a service, sometimes you gotta put up with stuff that are not ideal.
Think about it this way- if you reserve the right to do it, you can’t expect your house-mate also not to have the right to do it unless you have previously explicitly agreed on that arrangement.
If you for some reason got a new girlfriend and wanted to have her over all the time, you’d expect to be able to do that, right? If you wanted to volunteer to hold your book club meetings at your house, you’d want to be able to do that right? If your friend’s washer broke down and he asked to run a load through so his interview clothes would be clean for an important job interview, you’d expect to say “yeah, sure.”
But no doubt you also recognize that holding an all-night jackhammer contest would be out of bounds.
Your housemate expects to be able to do these things, too. And since he is a paying tenant, not a guest who you are doing a favor for, he does have some say.
I know your saying “But, but it’s my house! I ought to be able to make the rules!” Indeed, you can. There are plenty of housing situations that included clauses like “no guests” or “tenant does not have use of the common space.” But you have to do these things ahead of time, so that everyone knows the terms and can agree on them. You can’t just subject your tenant your changing whims. He needed to know your expectations a long time ago, and have a reasonable chance to agree on them.
Note that I’m not saying it’s not okay to whine. Whine all you want- roommates are obnoxious!