No good player will complain about you getting a few kills here or there. While supports shouldnt try to take the kills from the ADC, if they should so happen to get them in an all in there should be no complaining.
A matter of fact, good and knowledgeable players dont complain cause they know those deaths will hurt the opposition much more than not getting the gold affects them. Only ignorant "team death match" players that are more worried about kills complain about this stuff. Objective focused, team oriented players may think "Aww, I wish I had that gold... but at least WE have that gold." They will see you getting that gold as an investment in team/lane dominance instead of some petty reason to rage.
To some extent it may not be their faults. Only the lower end players complain about that kind of stuff, and that means they probably play with lower end supports who think theyre mid laners and TRY to take kills, farm, and will sit back and wait for the enemy bot lane to all in their ADC and when they die will jump out and try to get a double kill. So when they see you get kills, they think they have another shitheaded clown trying to "support." The real issue is that theyre both bad. The "support" for being a "support" and the ADC for worrying about it so much.
Anyone who cries cause you got kills and wants to intent feed after... you werent going to win, theyre a troll looking for "some reason" to get tilted and feed, they just happen to blame it on you getting kills cause that happened. If it wasnt that, then it would be baiting the mid laner or jungler into an argument then demanding they apologize for a statement or they will feed. Tell them to go ahead and feed, and try to get them to confirm it in chat with "why are you feeding?" so it can be in the chat logs.
Sorry thats your "tier" of player you have to deal with... Iv been there. This is all assuming youre not playing "No sightstone ignite Lux" and trying to KS with the attitude that any kill you could take was one they couldnt get cause you took it... Who knows, but its probably dullard ADCs crying cause I still see that from time to time.