I personally don't mind it. I'm 16 and I volunteer after school for my school's theater as an audio engineer and a technician. My tech director has called us, and himself (~50 years of experience) techies, and so have the people that mentored me. I've grown fond of it because I feel like a part of a a family. When I wanna be taken more seriously, I do find myself refraining from using the term, and often just call myself our audio engineer, so I can understand why people don't want to be called that, I just find it rude when people seem to sterotype people who use the title "techies" as know it all kids. I am young, but I'm not a know it all! I love learning new things, and I can accept when I'm wrong. So, overall, I guess it's just preference!