...a lot of jokes were made about Kelly being with lots of guys and about Bud not being able to get a girlfriend, yet Bud was seen with quite a lot of girls on the show and Kelly was not shown with that many men.
Kelly didn't have a long term boyfriend on the show. Bud was shown on the show with quite a number of women and he also had something going with Marcy's niece Amber.
I think he just means that the girls Bud was with were shown more. Yes he failed most of the times, but they were shown more times.
I guess it's not a good point, as there was no reason to keep showing Kelly's 'boyfriends' every time, while it made sense to actually show Bud getting rejected