Like, I mean like wow, you know? Could I afford a speech therapist I'd target my "likes" before my "you know"'s. I'd guess that it is social anxiety based where the speaker fears their presence is so dull that they will lose the floor if they pause between thoughts, so they keep talking when they have nothing to say, using "you know" to hold the floor. May also be his fear that his listeners aren't keeping up. For me I'm aware of my frequent use of "like" in descriptive and comparative communications. Hard to eliminate though. I should maybe write out alternatives for the word like when making comparative descriptions. Or simply stop making comparative descriptions. Or accept that if (unknown) was like (known) then like is a fine word for "similar to"/ "about the same as"/ "in the ballpark of" etc.