Crude speech is different from cussing.
Using cuss words like the f bomb is different from using crude speech like saying “aww this guy in front of me is driving like a zipperhead!” vs “this guy in front of me is an f bomb”.
The former is a little crude, but probably not even venially sinful. The latter is both crude and cussing, and as such it is venially sinful.
Colossians 3:8 “But now put them all away: anger, wrath, malice, slander, and foul talk from your mouth.”
Ephesians 4:29 “Let no evil talk come out of your mouths, but only such as is good for edifying, as fits the occasion, that it may impart grace to those who hear.”