Did anybody mention my favorite? “Your” is all too commonly used instead of “you’re”?
”Your” is possessive as in “your shoes”.
“You’re” is the shortened form of “you are”.
I think this particular mistake and the use of gonna are as a result of laziness whereas most of the other mistakes mentioned are plain old ignorance of the English language and grammar.
Sometimes you can forget yourself and fall into bad habits. I’m guilty of using “ain’t” even though some do not consider it to be a legitimate word. ☺️
In today’s world, it is the rare person who has halfway decent grammar. Usually it is an older person. Too many younger people have awful spelling and grammar and get angry if it’s pointed out. They feel it should go out the window with other traditions.