In addition, some of us BrE speakers attempt to include the AmE variant in our responses too when we are familiar with them. It would be entirely unfair on learners if they were only given one variant. The only problem comes when someone writes something like "xxx is NEVER acceptable" etc, only to find that it's perfectly acceptable in another variant. I rarely say "never" or "always" in my responses anyway but if I do, I will always qualify it with "in BrE".