I don't use Twitter, but based on what I see on Instagram, I agree with the parent that those people look like asses. It comes off as whoring for followers, and a bit desperate.

I think it's different, however, if there are a few hashtags at the end which in themselves are jokes or metajokes and that add to the cleverness of the post, in the same way that XKCD alt-text does. A string of simple categories (#joke #jokes #funny #comedy) is just annoying.