Maybe if you're a very impressionable person. We're all shaped to an extent by a racist society but it's a hell of a stretch to say reading a forum where people are racist will therefore make you racist.
Let me browse /x/ in peace without becoming racist by association
Oh wait are you talking about like, dedicated being-racist forums? I mean, if you're just scouting out what people say then no, but think about why you're actually looking at those places. But like, I'm not gonna criticise you for reading a site lol. At the end of the day, it's just reading, you're not hurting anyone, just be sure to not let racist tendencies to slip in by habit- it's only a problem when it turns into actions.