You know that there is a fine line between being polite and boot-licking?
Honestly, I don't see the stigma against using many compliments at once. The term "boot-licking" itself is baffling. It's obvious it was created to combat fake compliments used for personal gain; however people often blend that with genuine words. Hence, unless you are in person (so you can see if it's a facade or not) and sure about it, you shouldn't say somebody is boot-licking.