People saying mean things to you or about you isn't really discrimination. You can still say your thing and even be mean to others if you think that's needed to counter the other mean users (usually it isn't).

Discrimination IMO would be e.g. moderators deleting posts of certain groups of users based entirely on who those users are and not on whether they break the rules. I don't think that's happening.

Also keep in mind that personal attacks are typically against the rules (off topic, low value posts) so if someone posts something that is entirely targeted at you and not at the topic of the thread - you can report it to moderators. However if the post is only partially off topic, it will likely stay. This is where the "Ignore" feature comes in handy.