Re: To acknowledge/ not acknowledge , or say thanks for a gift received
With weddings I have usually seen thank you cards. With housewarmings though…you may not see a thank you card. The host that has invited you to their housewarming party is usually running around tending to hospitality needs and doesn’t really keep track of which guest brought which gift until after the guests leave. Some folks think that it’s an “even” exchange: you came to my house and I cooked for you…and you got a gift…hisaab baraabar. I am not saying k that’s right...but some folks could possibly have that thought process…and they then make a mental note to themselves to give you a similar “return” (in the form of a gift) in the future…the next time that you are the host and they are the guest.
I understand that at the very least a verbal thank you (if not a card) is the polite thing to do. And sometimes people say “thank you” in different ways like “oh you shouldn’t have”…“tsk tsk…takalluf kia aap ne”…“is ki kya zaroorat thi?”…“aydi ki load si?” 
Easier said than done, but try not to let it bother because you can’t force someone to respond in the way you want. But to ease your heart toward them…try reminding yourself that if you bought the bride/groom a gift or gave them money…then they, too, had spent a sizable amount of money and energy in arranging for every guest’s meal and seating and entertainment. Weddings are expensive. Similarly, the host of the housewarming also spent time/money/energy in hospitality. So aap ne kuch dia and us k badlay main kuch milaa bhi.
Apart from that, you can also opt to lower your expectations or spending amount as well in the future.