Is it a bad sign if the HVAC professional you hired to fix your system says . . .

“I don’t know anything about Nest thermostats, I’m a Honeywell guy”?

That’s a bad sign right? I mean, I believe Nest has a third of the smart thermostat market in the US. I hired the guy to fix my system that uses a Nest thermostat and he doesn’t seem to know how to diagnose or fix the problem.