Are we not allowed to use different fonts anymore?

You misunderstand.

I am colorblind. I don’t see green very well. That’s what I meant by 10% of the population has trouble reading your posts. That wasn’t how it appeared to me exactly, it’s a simulation of the sort of the low contrast problem you generated for my vision.

This site is intended for web designer but it discusses color selection and text with several illustrations as to why that can be a problem for those of us whose color vision isn’t normal.

While I wasn’t as bothered by your color selection as many others here, it’s largely because I couldn’t see your posts very well. In many ways, it’s as if you were on “ignore” from my viewpoint. Unfortunate, if you were saying something I was interested in reading.