Sometimes implies excessive fussiness or hard to satisfy, which might be criticized. He's so choosy with his clothing, it's almost impossible to buy him a gift.
Pro Tip 2/3
Positive Quality
Can denote good taste and decision-making when selecting quality items or relationships. A choosy shopper, she always finds the best organic products.
Pro Tip 3/3
Collocation Context
Used with 'about' to highlight specific areas where one is discerning. You should be choosy about the contracts you sign.