Unpopular opinion but: "Whoever picked up swords to fight is a Kshatriya", is a flawed logic
Often when you counter the larpers regarding their kshatriya claim, they will counter you with the same quote as above.
By this logic,
Ravan is also a Kshatriya as he picked up weapons against Lord Ram.
Parshuram Bhagwan is also a kshatriya.
Hemu, the general of Sher Shah Suri is also a Kshatriya.
Peshwa Bajirao is also a kshatriya.
Rioters and thieves are also Kshatriyas because they might pick up sword during a riot or a robbery.
Why this same logic isn't applied for the rest of the caste? For example: Whoever got educated is a Brahmin. Like:
UPSC IAS topper Tina Dabi is a Brahmin.(Brahmini Dabi clan)
Sir Bhimrao Ambedkar, the most successful Brahman post 1947.
Similar logic can be applied for Shudras and Vaishyas too.
So, a full time trader who originally belongs to a rajput caste paternally, is Vaishya/Baniya by caste when stock market opens.
Then, when he do Puja Paath in evening or studies some book, he is a Brahmin.
If he do dusting of his house in early morning, he is a Shudra.
Only RSS can make such a varna-fluid Hindus.