freetube shows shorts in the same way it shows normal videos, just in a separate category. you have to look for them and click to see them and they don't push you to jump to the next one, and most importantly they are not random, just your subscribed channels.
some channels use them as intro/overview for their longer videos which i find useful. other channels use them for stupid stuff which i ignore.
you can ignore them completely if you want. freetube also has a category for livestreams, which i ignore to the point that i forget it's there.
grayjay could support shorts in the same way.