Here's a tip: it makes you look bad, and it makes you look like you are jealous. Perhaps the girls' outfits are too trendy or bizarre for you, but by getting great pleasure out of ripping them apart, you seem petty and also threatened by them, perhaps their personality or general attractiveness.
Worst of all are girls who talk like this with their boyfriend. Tip #2: he's not interested, but maybe he'll tough out listening to you if you're good looking enough. —Mind your own clothes