When you are abroad and that you keep your nice French habit, some just look at you in a strange way, not really knowing how to behave with you.
On the other hand, foreigners do not know how to do with these French people who are kissing everybody and who are always kissing each other !
As a French, we all know that there are some rules behind the French kiss and kissing people does not mean that you do have some feelings for somebody, but it does not mean either that you do not have some, here is the trick :)
For example, we do not kiss somebody we see for the very first time (unless it is the friend of a friend or you were already in touch with this person). Usually it means that we estimate people. We also do not have to give a kiss to people we do not like. In South of France we kiss each other more frequently that in the North.
Rules are however very difficult to catch behind this so my advice is just to follow the movement, isn't it always nice to receive a kiss?