Earlier quoted context omitted.
Unfortunately, not many others would be willing to put much faith in someone with the grammar of a 6th grader to do a better job at UX design than a multi-billion dollar company.
https://yourlogicalfallacyis.com/ad-hominem
There are further reasons it's not an ad hominem - I recommend you read The Ad Hominem Fallacy Fallacy [1]. I don't mean to criticize - I made the same mistake until recently, so I offer the article in a spirit of goodwill, not superiority.