Me and my sponsor got talking about bad song lyrics, I personally get a lot of joy discussing bad songs and bad lyrics.
For funny bad, my favorite ever goes to Soulja Boy with 2 Milli. The song itself is alright, being a remix of the famous I'm God by Lil B. Soulja Boy is generally a pretty generic rapper that has funny lines here and there.

Now for most offensive, this easily goes to Good Vs Evil by Forgiato Blow and JJ Lawhorn CW: Racism, lynching

Not only is this song vile from a musical perspective, being trap country, but it's pretty much a modern lynching anthem. The picture is the chorus, and the verses are just listing off people of color who have killed white people. They even have a lyric like "We don't judge by race we judge by soul" trying to cover their asses for one of the worst songs I've ever heard
that one pedophile song that kid rock did for osmosis jones is pretty bad. i think ted nugent also has one of those.
for overall grossness though, in terms of more mainstream music than 5Gautomaticselfsucc up there, i've gotta go with "courtesy of the red, white, and blue" - tobias keith. a genocide anthem for the 21st century.
holy shit I'd not heard that red white and blue one
contends with Darryl Worley's 'Have You Forgotten'