If it helps, probably not

A tankie is a kind of communist that is disliked by other communists. So you know if someone calls you a tankie, that person is a leftie and they agree you're a leftie too, but the bad ones.

It comes from the invasion of socialist Hungary (?? Not really sure here) by Soviet tanks. There were people for and against it. The ones in Hungary defending Soviet point of view, that is, supporting tanks imposing social order, were called tankies.