"We don't serve women here"

"We don't serve Chinese here"

"We don't serve emacs users here"

"We don't serve zerg rushers here"

"We don't serve pubg players here"

"We don't serve Ayn Rand fans here"

"We don't serve sex offenders here"

"We don't serve bearded fellows here"

"We don't serve tank top wearers here"

"we don't serve smokers here"

"We don't serve short people here"

"We don't serve underhand servers here"

"We don't serve pedophobes here"

"We don't serve <subset of humans> here"

It doesn't matter. It is his choice and his business.