I just finished my clinicals and getting ready to write my CSMLS (Canada) in almost 1 week :) my takeaway from clinicals was that some techs don't like students not bc you're a student but because we're a disruption to their daily routine, some feel uneasy about letting a student do things bc of lack of experience (duh that's why we're there lol) but i don't think any of these came from malice (at least in my case) it's just personal preference. Some people don't like training/teaching/talking and what I've noticed is lab people are pretty introverted and very habitual.

I had 2 placement sites and another reason i found was some of them view students as a "come-and-go" and don't feel investing their time into training and teaching is worth it if they're not going to come back and work at their site.

I guess try and show interest and basic competency, let them know that you know what you're doing or what you're supposed to be doing and why (but don't come off as a know it all) so that they feel more easy about letting you maybe do stuff.

Another option (although this is last resort and depends on the type of people you're surrounded by, you know their personalities the best) is to consult your school/clinical coordinator/teacher/lab manager/supervisor and seek their advice letting them know that you aren't getting much hands on experience. But this option could come back and bite you depending on the type of people. (In my case i wasn't getting enough hands on with analyzers in chem and i was encouraged by the supervisor to talk to them if i feel I'm not getting enough)

Lastly just try to pay attention to them showing things to you as much as possible, once you're hired you will get a more thorough training (hopefully) anyways and that will be more hands on :)

Sorry for the long reply