Flattery can seem fake if it's overdone or not genuine. People usually prefer honest compliments. Just saying 'I admire your work' is better than too much flattery.
Pro Tip 2/3
Social Tactic
People use flattery to make others feel good, sometimes with a hidden agenda like seeking favors. She flattered her boss with compliments before asking for a day off.
Pro Tip 3/3
Negative Impression
Too much flattery can make someone seem untrustworthy or insincere. It's often seen negatively. His constant flattery makes him appear insincere.