oof. Ignoring the uncomfortable and unsympathetic assumptions you are making, I will again reiterate what I have in other comments:
it would kind of defeat the purpose of the UBI if people had to spend it on mitigating the consequences of people taking advantage of them receiving UBI
Your argument makes no sense. We can just replace "UBI" with "job".
It would kind of defeat the purpose of making money with a job if people had to spend their earned money on mitigating the consequences of people taking advantage of them receiving money.
So... the takeaway is strive to earn less so you get preyed on less?
I don't agree. Jobs are much more than just income. They provide purpose, skills (possibly for life and future work), experience (in general and for acquiring future work), possible medical or investment benefits, connections (social and for future work) etc. All these things mean that there are many situations where earning less or having to move would be outweighed by the benefits.
This is not the case in my example - UBI is JUST income. If the providing of UBI creates more problems and negates the income, then it loses its benefit and purpose (not saying this would be a guaranteed problem inherent to UBI, but that was the premise of the OP)
I would suggest that, whether or not you identify with/have been part of a group, you consider that your perspective/experience very possibly is not the experience of everyone else in that group.
Poor people don't have functional families or communities of support in a lot of cases, that's why they're poor.