Fortunately you don't really know if you are, they don't "see" you so you don't get any replies from them but, one doesn't get replies from most people so no way to tell who just doesn't read/reply and who feels they have a problem with your posts. Presumably if someone doesn't like you, you aren't great friends with them in the first place.

I'm with Gus. Don't forget it is the person doing the ignoring who has a problem with how they feel about how you express yourself, not "you" or what you are actually saying/doing.