The vehemence against bodhran and banjo players is mostly expressed by those who cannot play themselves.
Both instruments require a lot of skill to play well.
Certainly a poorly played bodhran or banjo is painful to hear, but no more so than any other instrument played badly.
A well played bodhran is a delightful accompaniment to some (but not all) tunes. Personally, I love Christy Moore's use of the instrument.
But then it is always a matter of taste.

By the way, we use one to collect the whip-round money each night!
Is this a correct usage?