Why would you call someone stupid?

I’m in the store the other day and 2 college students are talking when one says to the other, “OMG man! that was stupid. How stupid can you be? Man! you are just too stupid.”

I really really dislike that word and I’m thinking to myself, there has to be at least 100 other ways he could have called his buddy stupid. What do you think?

What’s your take on the word stupid? What are some clever ways of calling someone the “s” word?