I totally agree to this and find it very annoying the way it is now. I use my own target filters and for FATEs especially, when I have it on enemies only, it cycles through everyone else's summons, while I try to target the mob, and when it finally does, it's too late and it already died.
We have already the ignore minions option which is very useful, but we also need it for summons.
Also it is very annoying if you try and target the retainer bell in a city and you have to go through everyone's personal Ifrit/Titan/Garuda first.