Like Saeed said, Do Spar and spar how you wan't. You shouldn't care if others don't like how you spar. Like Saeed also said people will find excuses for why they lost, Even if it was impossible to wall they'd still find a way to make it happen. While walling can be a good strategy for limiting the amount of directions you can be attacked and forming counters if you know what direction they will attack in, It suffers downsides given it is more easier to predict what someone who walls will move to or do.
There is advantages and disadvantages to everything in spar, For every strong point there is a weak point. Walling is no different. If you want to use the area around you for advantages then do it, In the end whether you do it or not people will find excuses. Spar how you like and what you feel will help you and make you more likely to win. Regardless of the excuses they make why they lost, Just don't cheat with godmode hacks or speed hacks or anything like that for obvious reasons.