Answer

In general, yes — active participation by Jain sadhus in national flag hoisting or similar ceremonial public functions is usually seen as against the spirit of renunciation.

Explanation

Jain sadhus and sadhvis live by strict vows of:

• Detachment from worldly affairs
• Non-involvement in political or social display
• Avoidance of ownership, ceremony, and public prestige

Because of this, they normally do not take part in activities like:

• flag hoisting
• inaugurations
• public honors
• political ceremonies
• functions that create worldly attachment or social status

If a sadhu is only present quietly as a respectful observer, some people may not view that as the same thing as active participation. But actually hoisting the flag, leading the ceremony, or being formally involved is generally not considered appropriate for a renunciant.

Spiritual Understanding

In Jain Dharma, a sadhu’s life is meant for:

• vairagya — detachment
• ahimsa — non-violence
• samyak charitra — right conduct
• moksha-marg — the path to liberation

Public rituals tied to nation, prestige, or ceremony can pull the monk toward worldly identity. That is why such participation is usually avoided.

Takeaway

So, yes, it is generally considered a violation of monastic discipline if a Jain sadhu actively participates in flag hoisting. The exact assessment can vary by sect and circumstance, but the traditional Jain ideal is clear: a sadhu should remain separate from worldly ceremonies.