I’m not understanding what your issue is.
Are you upset because you were asked to give the same as a “family” of 2, 3, 4? Those family have proportionately more income, possibly (if the wife works), but also proportionately more expenses with more mouths to feed, more water, electricity, insurance, etc.
Single people often, but not always, have more disposable income than families.
However, as I pointed out earlier, the pastor should not have asked for a set amount from every family, it should be based on ability to give. Some families can likely give much more than $4K and some may need to give much less.
If you gave what you thought you could give, then that’s fine.
I’m still not really sure exactly what your question is here.