No. A single statement can never be gaslighting. Gaslighting is a process. Being told to be wrong (even if you may be correct) is not gaslighting either. The important element is to plant doubts about your _perception_.
""I spoke to everyone and they all think I am wrong" is a different statement than "I spoke to everyone and they all think you are wrong".
Continously being told to "be wrong" can instill such doubts, but more precisely it would be me worrying about you "seeing it wrong", not accusing you of _being_ wrong about something. Your quote does not necessarily carry that meaning.
I am your friend, trust me.