Maybe you can go to your neighbor's grandkids grade school while riding the short bus & show them your insult skills. Maybe after taking 6th grade 2 or 3 time you might graduate to something passable as an insult, as long as the school allows grading on a scale and D+ passable for 4th grade, as a 6th grader. You, specifically will need to provide proof after the 3rd time you passed the 6th grade insult class.
Might need to check that you're not on safe spaces list. I know at an advanced age, (You know different times n' all) that one's memory, 'changes' when dealing with underclassmen when you are... the school janitor.