It takes less energy for me to just smile and accept a compliment than to try and figure out the intention behind it. It is none of my business if the compliment is fake or genuine. That issue is with the other person.
In the past I would down play compliments or wonder if they were really sincere. Now I just smile and accept them. I would also feel the need to always return the compliment, sometimes struggling to find the right words. Now I just go with the flow.
Thinking about why people say nice things to me or if they really mean them is cumbersome.
The same goes for insults. I no longer try to figure out the intention behind them. If intentions are meant to be revealed they will be revealed.