Haha yeah I've never been friendzoned when I want someone I just take them. I typically win them over but as for me friendzoning I have never done it either I only know you cant do it effectively.
Once someone has decided they've got romantic feelings for you and they decide to pursue it well once you've denied that to said person being friends is only going to keep that person around so they can see you move on. Not very healthy for said individual and it'll have them ask the whole time why them but not me, you can friendzone all you like just do them a favor and let them go don't keep them around it isn't healthy and besides that person will always be looking for something more then being friends and that eventually will end said friendship.
What I've learned is simple, if you know that person has romantic feelings for you and you want to remain friends. Then it simply is a difficult situation and all you can really do is make sure from the get go that you have no romantic intentions with them.