(I can't believe I'm giving an English lesson on 'fluffy' and 'fuzzy')

Each of these words can mean the same, or change into different meanings... depends on situation, tone, and context... and each can become very pleasant...or an insult.

"The teddy bear is fluffy... the teddy bear is fuzzy."

Each of these is pleasant... but "fluffy" is softer to touch, more pleasing. "Fluffy" is closer to velvet, "fuzzy" is closer to wool, or a boar's hair (coarser, not as soft as velvet).

"He speaks fluffy." This can be considered to be negative, an insult. Someone who is "conceited"... someone who thinks he or she is better, more important than you, and speaks to you in a very formal, or "patronizing" way. For some English-speakers, this gives the feeling of a "master talking to a servant (you)". Prince talking to a floor-scrubber.

"He speaks fuzzy." This can also have several meanings, but it is sometimes an insult, offensive. If you say "you speak fuzzy" to me, then I may think you are saying my English grammar, vocabulary, pronounciation, or spelling is bad...that my English is not clear, and that I am making mistakes, so my English must be bad.

This is a basic explanation, from my own experience as an English professor. There are other meanings for these words, but most are based on context and... very importantly, location. This is part of the difficulty of English... meanings can change from New York, to Texas, to Los Angeles. Aussie, Ireland, Britain, Canada also.

My opinion after teaching many Spaniards and Russians.