Question Japanese line

ただ、父の威光を傘にして、威張り散らすだけの詰まらない男だった。

The best way to translate this?

Context: She's talking about a guy who just boasts about their father's money, while having no merit themselves.

 

But using his father's authority as a shield, he was a foolish man who flaunted his power everywhere.

Something like that maybe? Not completely literal but gets the meaning across.

 

He was simply a boring man who just used his father's power/prestige as a shield to boast.

 

Thanks!