poor lecturers / course change

Late feedback is an issue you can raise through your course reps. Has this been highlighted to them? Lab tech mistakes is something to flag through the course reps as well. Being given incorrect chemicals may also be a health and safety issue to be raised urgently.

Minimal feedback is relative and hard to quantify. Generally you shouldn't expect extremely detailed feedback on any piece of uni work, although there should be some feedback. You won't have notes on every mistake explaining exactly what you did wrong for example - it's not like school. Lecturers often have hundreds of pieces of work to go through. Brief notes is the standard at most universities in my experience (outside of very, very small modules with less than 10 students). So this may simply be a matter of managing your own expectations.

"Unhelpful" and "passive aggressive" emails are hard to gauge here. What do you mean? If you mean that they only wrote a couple sentences in reply, then this isn't necessarily passive aggressive and may well be as helpful as they can be. Remember again - lecturers have hundreds of students on a given module oftentimes, will frequently be teaching multiple modules, will also have a host of administrative duties beyond those, and on top of that need to do their actual job which is academic research.They aren't teachers who are paid exclusively and only for the purpose of teaching you (and bear in mind even teachers who are paid specifically to do just that in schools 2 in 5 teachers work 26 hours a week unpaid on average on top of their normal work!).

Ultimately lecturers have little to gain by being "passive aggressive" and are unlikely to realistically be that invested in any given student to spend the time on such emotional responses to things. Also remember, it's easy for text to be misinterpreted in an email - tone is hard to convey there. It may be purely neutral. And again, helpfulness is relative. So this may also be a matter of managing expectations - as it may well be the same at all universities, on all courses.

Regarding feedback and "helpfulness" from lecturers - have you gone to office hours to ask questions? As those are the dedicated times for lecturers to provide support or further detail on feedback, and often they are more than happy to help in that time where they have been set aside the time to do so. It's also usually easier to communicate in person in terms of tone etc to gauge whether they are actually being "passive aggressive" or "unhelpful" if they just don't have much else to add.

Overall, without further detail/examples, it's hard to say that this is actually what you are making of it and not just the nature of university level study which would be much the same at any uni on any course. So as noted above - you may need to manage your expectations here.

late feedback has been raised and their response was that “it cannot always be returned on time” but it never is.

i’ve raised the lab tech issues too and was told that i myself need to be mindful of what chemicals i’m using and they dismissed the responsibility of the lab tech in that situation.

when i say minimal feedback i mean comments just saying “detail” or “?”. there’s only 24 people on my module too.

the passive aggressive emails for example: i got a piece of feedback stating i must do something to scale, but was told in a lab session that it shouldn’t be to scale. i emailed for clarification on this and the lecturer pasted the exact same feedback into the email and said “thats not why you didnt get full marks” ?