"Does the treatment by China to its citizens and to HK citizens affect the way you make your purchasing decisions?" -- Maybe it should. Interestingly, there are folks who feel it is appropriate to boycott Israel, because of alleged maltreatment of Palestinians. (This, despite the fact that some Palestinians shoot off missiles or engage in other terrorist activity). Yet, I am unaware of any organization seeking to boycott Chinese imported goods, just because they harvest organs from living unwilling donors, keep political prisoners in horrible conditions, and thwart attempts to democratize--and so forth. Maybe there should be a boycott China movement.
"Alleged maltreatment of Palestinians"? Realizing this topic has more layers than an onion, but I think "alleged" is an inaccurate adjective. Not to every Palestinian, but it's happening. However, I wouldn't paint a broad brush on the entire country and people of Israel and boycott it, any more than 'some Palestinians engage in terrorist activities' means all Palestinians deserved to be maltreated.