What in particular is wrong with it.
In theory it's no worse, I suppose, than selling MAGA hats and t-shirts, but this isn't his campaign selling shoes to raise funds, this is a private venture of Trump cashing in on his name for personal gain while still actively running for President.
It just seems so cheesy, and unPresidential to me.
If he weren't actively running for office, it wouldn't bother me in the least.
Other than the fact that they are hideous?