It’s not making fun of suicide. It’s not glorifying it or making it seem like a good thing. It’s poking fun at Guy Feieri, and how he loves flavor so much he’d season a bullet even in the depths of despair. Taking suicide seriously is a prerequisite to enjoying the joke.
Being exposed to triggering material sucks, and I’m sorry for your loss. I hope you can get to a place where you’re comfortable engaging with humor around this topic some day!