Depending on the MTR exit, it's 6-7 minute walk to Knutsford Terrace, less to Mira. Taxi drivers here don't like short hops; they never have. They want the longer, more lucrative rides. A two-min ride for just the flag fall? Nope.
Again at night, they want to be picky about the rides. No it's not legal. Yes it's annoying as f...
You can report them, for what it's worth. Don't know what 'tags' are but to report a driver you need the Taxi Driver Identity Plate Number with Name of Driver (take a photo) or Vehicle Registration Number (but ideally both), plus other details.
Report Form:
https://www.tcu.gov.hk/taxi/index.htm