You can hold whatever selfish, "fuck you, got mine- try being born into better circumstances next time, losers!" opinion you want. Your free speech doesn't mean everyone else has to listen intently and earnestly and keep themselves from thinking you're being an a-hole for holding the opinions you do. It also doesn't mean some private social media outlets can't tell you to piss off for posting them in a forum about metal music. There are plenty of places online where you can post such an opinion and be back-slapped and congratulated; lamenting that one takes a preemptive stance against opinions you hold is pretty tender for one who takes such a cold-hearted stance against refugees.
See how libertarians see taxes. They could also write some melancholic paragraphs like yours. "Imagine you're a hard, honest worker and someone told you part of your money is not yours, you have to give up some of it and give it to the government. Would you consider it a personal attack? Someone challenges your very right to have your own property... and that's not personal?"
The thing is that, yes, wanting to reduce the amount of immigrants (for example) is a mainstream political stance. Brexit happened over less! We should be able to have and express our own political ideas as long as we don't go out of our way to harass people over them.
This is not about that Mastodon instance in particular, since most instances have the same left-leaning rules.
>The thing is that, yes, wanting to reduce the amount of immigrants (for example) is a mainstream political stance.
We were talking about refugees, not immigrants.