..is there a Steam group..

I don't disagree.
He said OP didn't have a right to say dumb shit, my point is that he has as much of a right to say dumb shit as he does.

thanks ❤️️

That's not what you wrote. If you want it to be read that way, write what you mean, not something else.

But that doesn't mean bisexual people have mental issues. It's ridiculous.

No one said anything about bisexual people in particular, you are filling in the blanks. As far as it looks like his issue is not with the LGB part, rather the other additions.
Neither I am defending such misconceptions.

If you're so insisting about rights,

You brought it up. The point is that if you are allowed to say whatever you want so would he.

Do they have the right to be called 'with mental issues' ?

There is no right to be called something or not to be. You also don't have a right not to be offended by the dumb things people say.

And no human can't humiliate another one. If they are... that means they feel superior then them.

Can or can't isn't the point, and it's not what was written.

Nobody's different or superior. -> It doesn't mean we're the ''normal ones'' and they have ''mental issues'' just because they have different sexuality then us. That's what that means.

My point is you don't write clearly, just read that and see there is no connection between the two things; also, the second part doesn't make sense as written. People are different; and, yes, things like a nonconformist sexuality don't necessitate a person having mental issues. You could have written that instead of what you did write.

Well, I'm sorry I just try to protect them when some people humiliates them.

You shouldn't be offended on other's behalf, especially when it's not clear who is being insulted or how. Not to say that anything he is saying is reasonable.

¯\_(ツ)_/¯

Getting offended you are just helping to prove his point on the first category of people he evidently dislikes.