um, you guys

My head wants to explode listening to a webinar on interviewing for your dream job.
After the first half hour now that everyone is confident and warmed up, in the final 28-minutes alone counted…… 144 “um”!!!!
WHAT?!
Um, when did “um” become the first word in a proper sentence you guys?!
Which is the other telltale of a professional; or not.
Unless you are really talking to a group of dudes, forget the, “Thanks you guys”.
“Thank you” is fine.