Squash Old Boys

I'm trying to play more social and Americano events, when I can actually get a place on them, and I'm finding myself encountering men over a certain age who have clearly played a lot of squash in their time. They generally have 1 shot; a hard, flat slice. Used for their serve and their back of court shots. I find these shots, particularly on their serve, hard to return and just end up getting frustrated. The glass rebound is very low and I struggle to return. I'm only a level 1.1 on Playtomic, however am probably closer to a 1.8/2, I just haven't played any competitive matches in a long while. I'm just after some advice and also opinions from other players who encounter these one shot squash players. I know I need to stop it getting to me, but I just get frustrated, especially during socials where you're there to play Padel, not watch a ball go past you every serve. I also see, that given the pace they put on it, there is no chance of them reaching the net position before my (possible) return, so that adds to the pressure as I know that if I can return it it'll catch them out.... If only I could 😭.