I agree that both official pro and con Brexit campaigns were ... not good. I just think that there is clear difference between them in terms of how bad they were.

In political opinions, particularly for US politics, you see a lot of ritualistic opening with words to the effect of "both sides are terrible", "they're both equally bad", which is facile even-handedness, and unhelpful when they're differing kinds and degrees of bad. Knocking it back as facile is also becoming a trope, though probably still a necessary one.