Are Shock Collars Cruel?

My mom is trying to force me to use a shock collar on my dog. I've done research into it in the past when I was looking for training options and was horrified. I will absolutely NOT let that thing near my dog and it's times like these I wish I had the money to move out. What do y'all recommend I do to kindly convince her to not buy one, before I need to get more aggressive about how adamant I am about this NOT being the right option?
Are Shock Collars Cruel?
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