Is being an antirealist just being a troll?

I recognize I'm coming from a place of naivety. If your plan is to tell me to read more, I accept that, recommend me some literature though. To me the concept just seems silly but again I'm not educated on the subject to a degree higher than reading the Wikipedia page. I've seen it used as a defense on here sometimes. I always wonder if its just the speakers trump card for not having a cogent argument ( I guess thats the point). Also, I post here kinda frequently, if its more than appropriate, can a mod let me know?