I feel like I'm not getting my point across, the point is I may not be in a position to respond. I'm chairing a meeting, sharing my screen, or heck maybe just actually paying attention in a meeting rather than sat there staring at chat software, I'm not going to switch focus and say "hold on everyone, someone just asked me how my day is going, give me 30s to respond to them...". It's the equivalent of answering a phonecall in a meeting, complete no-no IMHO.
Just answer after the meeting then, just as you'd do with a phone call. (Unless of course, you're waiting for something important then you just leave the meeting to deal with it.)
Answering after a meeting doesn't compel you to engage in small talk, the reply I gave still applies, presumably most of the time you're not in meetings though even if you do have one or two a day.