People know from previous experiences (all public knowledge) that flattering the inflated ego of the self-professed Stable Genius who uses the best words, capable of making the most perfect phone calls is a sure way to divert the fool's attention away from oneself and onto other things.
Trump would always Tweet nice things about people who faltered him. It meant so much to him. So much, that he'd re-Tweet, and mention it during rallies, press conferences and probably out loud to himself in the toilet room (the ones stuffed with top secret papers).
Donald J. Trump, TRE45ON - The Unwitting Dupe is a holdover, the last of the Great White Hope figures from the 20th century