14. Commenting on someone’s appearance
Avoid telling a casual acquaintance or a colleague at work how much you adore their outfit or love their new ‘do. Though you can (and absolutely should) compliment others, giving overly personal praise to someone with whom you’re not close can come off as inappropriate.
When you want to say something nice, Jennifer Porter, a manners teacher and etiquette coach in Seattle, says you should “find ways to do it that don’t judge [either] positively or negatively. Say something like, ‘It’s so great to see you looking so happy! I can tell life is treating you well.'”