In LAX, the airport employee security 'line guard' didn't like my printed OLCI boarding pass from SU and sent me to the ticket counter to get a fresh BP.
I don't get it.
Why did a airport security employee checked your boarding pass?
Alaska usually arrives in LAX Terminal 6.
Aeroflot departs from TBIT. There is an airside walkway to get to TBIT. Once entering TBIT you do not have to pass security.
I would assume you have accidently left Terminal 6 to landside, otherwise, your story doesn't make much sense.