You beat me to it Blue Jays for I was going to be rather simply like "well not to bad since he washes it down with some coffee".
Still I guess we are thinking along the same line.
He could have wiped it on the aluminium he was next to & if at a table then the under part of the table as so many gum chewers do.
Like a few yrs ago when in for a cup of coffee & to relax from some yrs of riding, & so with a paper napkin I put the gum in it only to have the owner say to me "What is that?" & politely told her it was my gum & I could put it under the table if she likes. Gal had a good sense of humor & said if I did she would pour the coffee all over me then boot me out the door. Since then she has never come up with said question.