There are allegations (probably in the form of guilt by association), vaguely suggestive tweets (or tweets that have obvious potential for misinterpretation), a

There are allegations (probably in the form of guilt by association), vaguely suggestive tweets (or tweets that have obvious potential for misinterpretation), and things like that. I think you could make a very good case against that comment, but "ad hominem" isn't it IMO. I'd argue {{citation needed}}, "lacks substantiation", "slightly hyperbolic", or something like that.