That seems like overactive pattern-matching to me. Yew is a plant.

Jesus, people see nazis behind every blade of grass nowadays.

Pray tell, what is antisemitic about "YewTube?" Just that it's one letter away from "JewTube?" Sure, but if the creators intended to be antisemitic, why not just call it that then?

Oh I even checked urbandict to be sure that it couldn't be this and all I found was the happy sound surfer make "Yew".

I think that's just a sign of the times that you see right-wing and left-wing comments everywhere even when it isn't there at all.