What is classed as "Thrashing a car"?

[K93George]

So I'm at the lights in an 80 zone (my favourite time to rev the XR out a bit). I pop it in semi auto so it doesn't shift out of first too soon on me. I ease onto the accelerator to not spin the tyres and once they grip I gradually press further down on the pedal faster and faster till I reach around the 4.5k mark, then ease off and drop it in second, continuing to ease off and shift higher and higher, timing it so i just reach 6th gear when i reach the speed limit. I enjoy the surge and it sounds awesome!

My understanding is that higher revs and less throttle is better then low revs higher throttle (such as in od gears).

This is in no means the quickest way to take off but its fun and seems safest. To the point,,my aunty happened to be beside me -_- I got a huge talk about how I am going to wreck my new car, that she heard it screaming and if she was a cop she would of taken it right there and then. FFS, surely it couldn't been that bad, supposedly i was already at the end of the road before the other car even moved. This is a stock FG MK2 XR6 running on 98 since I bought it brand new, would you say I thrashed it? Am i being a reckless driver?