Stop it.

Seriously, stop saying this. The friendzone does exist. First impressions have a major impact on further subsequent interactions; this has been proven and is accessible to anyone who has taken an Introduction to Psychology course.

Granted, changing the way you act will change your further interactions with another individual as well, but the initial perception will still hold firm for a very long time. This is why it's suggested to drop all interactions with an individual to exit the friendzone.