How can other players view my individual Kills & Deaths?
If you set tf_scoreboard_mouse_mode you can interact with it and click on another users name to view their stats.
tf_scoreboard_mouse_mode 1
tf_scoreboard_mouse_mode 2
https://wiki.teamfortress.com/wiki/Scoreboard#Enable_mouse_input_on_the_scoreboard
This was from ~3 years ago: https://www.reddit.com/r/tf2/comments/3ch15t/psa_the_scoreboard_has_a_new_mouse_mode/