Anyone can learn to fight. How effective that is for the individual martial arts student depends on a series of factors, from what system is being studied to how much time and attention and energy goes into that study.
One major advantage of the Ving Tsun system is that it was made to be effective in the hands of a Han Chinese woman, who was likely neither large nor heavily muscled. So effective that she could use it against a warlord, who had been fighting all his life, and win. Ving Tsun’s height, weight, and body type could not be ignored in the question of how to win back her life – only the most effective techniques could be prioritized for study.
No matter who you are, there are challenges to be met day to day. Although those challenges are different depending on who you are and what your environment is, the confidence of martial arts study coupled with the genuine ability to back up that confidence with real fighting skill is always valuable, no matter what your personal context.